[Mapbuilder-proj] Bug or user error with lcc?

[David Z. <dz...@av...>]

Hello,

I am using proj4js, and I am having difficulty getting good projection with
a new projection definition.  It is entirely possible that I don't have the
correct syntax for the definition file (or that I am totally missing
something required), but it's giving results that are off by a factor of 3
in 1 dimension (either X or Y, but not both).

I am creating a definition for Pennsylvania State Plane, and this is the
file EPSG2272.js:

Proj4js.defs["EPSG:2272"] = "+proj=lcc \
+lon_0=-77.75 \
+lat_0=39.33333333333334 \
+lat_1=39.9333333333333 \
+lat_2=40.96666666666667 \
+y_0=0.0 \
+x_0=1968500.00 \
+ellps=GRS80 \
+datum=NAD83 \
+nadgrids=@null +no_defs";

I searched in http://www.epsg-registry.org/, and those are correct decimal
degrees values.  I try to transform the location of Philadelphia, PA (
-75.163808,39.951639 ), and I always get x:2189468, y:71889.  I am expecting
something like x:2694800,y:236500.

At first, I thought it was a ft/meter conversion, but when I add
"+to_meter=0.3048006096012192" to the definition, the projected Y coordinate
looks good, but the X coordinate is way off.

Any help would be greatly appreciated,
Thanks,
David